Adhesion Of Teeth

Write a short note on BisGMA and TEGDMA.
Answer:

BisGMA is one of the first multifunctional methacrylates used in dentistry.

BisGMA was developed by RL Bowen (Bowen resin) in the early 1960s.
The BisGMA resin is an aromatic ester of a methacrylate, synthesized from an epoxy resin (ethylene glycol of phenol A) and methyl methacrylate.
Because BisGMA has two-OH groups that form hydrogen bonds between the monomers, it is extremely viscous.
The high viscosity of BisGMA makes it very difficult to blend and manipulate, thus it is necessary to use lower molecular weight, highly fluid monomers to dilute BisGMA.
A low-viscosity methacrylate such as trimethylene glycol dimethacrylate (TEGDMA) is blended with it to reduce viscocity.
TEGDMA also has the advantage of producing extensive cross-linking among polymer chains. This results in a rigid resin matrix that is highly resistant to softening and/or degradation by heat and solvents such as water and alcohol.

Reader Interactions